Though London may seem more appealing during warmer months, insiders know that the city is at its most charming when temperatures starts to drop (and rain is a constant). This is when the city moves indoors—to cozy up beside crackling fireplaces in old pubs, meet for meals in the buzziest new restaurants and stroll around the latest (and greatest) exhibitions. There are plenty of reasons to do that right now. And if the sun does come out, layer up and head to the glorious parks or wander along t...